Metropolitan Los Angeles, A Study in Integration: Part IV. Law Enforcement.Robert F. WilcoxMetropolitan Los Angeles, A Study in Integration: Part V. Sanitation and Health.Winston W. Crouch , Wendell Maccoby , Margaret G. Morden , Richard BiggerMetropolitan Los Angeles, A Study in Integration: Part X. Personnel Management.Helen L. JonesMetropolitan Los Angeles, A Study in Integration: Part XI. Governmental Purchasing.Paul R. Beckett , Morris Plotkin , George Pollak